I currently have two boat/trailers that were purchased with Goodyear Marathon trailer tires installed (one dual axle and the other triple). In reading previous posts concerning trailer tires, they pretty much fall in line with my experience with the Marathons - POS! I've had one blow out and three tread seperations. I noticed one tire bulging and replaced it with the spare - while the bulging tire was on the spare mount it blew out within two weeks. I couldn't believe it! No load on the tire and the sidewall completely blew out. I always check my air pressures before hitting the road, so I know that has never been an issue. Anyways, I have heard good comments on the Greenball Towmaster and was considering going with that product. Any bad experiences with the Towmaster? I see that they have several different series (seems most are related to tire size) - I am looking at the ST (special trailer) product. Certainly can't beat the price. I've also heard about a brand called Kumho. Any positive comments with that brand? I know this is the place to go for opinions and comments - good and bad. Any feedback would be appreciated.